Stay-bolt connection for boilers.



.enano i VANIA.

Specification'o Letters latent.

STAY-BOLT CONNECTION EOt BGLERS.

Application lell November 6, 1915. Serial No. 60,051.

T0 all whom @'15 may Concern:

Be it known that we, BENJAMIN E. D.

STAFFORD and Flinomucnl. LANDGRAF, citizens of the United States, and residents ot Pittsburgh, inthe county, of Allegheny and Stateot' Penusylvz'inia, have invented certain new and useful Improvements in Stay- Bolt Connections for Boilers; and we do hereby declare the following to-'be a full, clear, and exact description Aof the invention, such as will enable others skilled in the art to which it appertains to make and use the same. ,i

Ourin-ventlonrelates to improvements in stay bolt connections for boilers.

ln an application for patent filed by Benjamin E. D. Stafford, October 30th, 1915, No. 58,868, a sleeve is secured by Welding 'to the outer face of the outer sheetJ of the boiler and carries and supports the stay bolt, the head of which 1s mounted for universal movement on a curved seat termed on the inner face of the sleeve.

This invention consists in a roof plate having openings for the passage of the bolt and provided with a depressed concave seat around each opening toform a seat for the bolt head, a sleeve or cover plate Welded to the roof plate around the bolt opening, and a screw cap closing the outer end oi' the sleeve or the opening" in the cover plate.

In the accompanying drawings, Figure 1 is a View partly in .section and partly in elevation or" our improvement, and Fig. 2 is a .view of a modification.

1 represents a roof plate or sheet of a locomotive boiler provided with an opening 2 for each stay bolt, the .said opening being slightly larger than the shank 3 of the bolt so as to permit of the relatively free lateral movement of the bolt in the opening. The plate 1 is bent inwardly at each bolt opening, as at 4, and the depressed or bent portion\ is provided on its outer face with a curved seat 5 for the head 6 of the'bolt. rThe head of the bolt therefore` rests directly against the outer tace of the out/er plate of the boiler and as the seat for the head is depressed, the head if spherical, projects but slightly beyond the outer plane of the outer plate 1.

Welded to .the plate l around the depressed seats therein, and consequently around the bolt openings, are Vthe sleeves' 7, one for each bolt. The inner end ci each sleeve is milled to conform to the surface v ol' the plate against which it bears, so that it will have an extended and solid bearing on said plate, and the weldinif; of the sleeve to the plate is done by the' onyaeetylene, en' electric, -or any other approved forni or method of Welding.

The sleeve. I is provided at its outer end with internal threads for the attachment of the cap 8 which latter forms a closure nl the head of the bolt. I

rThe weldingl composition fusing; the sleeve to the plate, is pre applied at the outer and inner lower et es of the sleeve as shown at 9 and '19, so that lo the union between the plate and sleeve is o3 a homogeneous character whereby advantages et' a. sleeve plate are obtained.

l desired, a bolt "with a head lattey top may be used, as shown .in 2. vif ith such a construction the head will be Wholly within the depressed seat in the plate, tienes instead of using a sleeve, a flat cover plate 11 may be Welded tothe plate 1, the bolt hole in the cover plate being closed by the screw cap 8a.. A

With this improvement the bolt bears` directly Von the outer plate which latter receives 'all shocks and stresses incitientalL in' the installation of the bolt, and' alsov all' f stresses nue to boiler pressure,` While -tlie housing for the bolt takes only the collapsing' stresses.

t is evident that changes in the construc tion and relative arrangement of the several parts might be made Without avoiding our invention and hence We would have it une' derstood that We do notrestrict ourselves to the particular construction and arrangement of parts shown and described,except as required by the scope of the appended claims.

Having fully described our invention what we claim as new and desire to secure l by LettersePatent, is: 1

1. In stay bolt connection for a boiler, the combination of a boilerplate having a depressed seat for the head of the stay `bolt and a bolt opening at the bottom of the del pression, a housingwelded to the plate,

pressedgseat for the head of the stay bolt,

and a bolt opening :it-the bottom-0f the (le- I.pressio11, a sleeve welded to said plate around the (leln'essed seat, uml n screw cap eloshlg the outer end of the sleeve.

' 3. In' stay bolt connection for u boiler, the combmutlon of n boller plate lun-'111g :l depressed sent forthe heaul of the stziy bolt,

' and u Abolt opening' at the bottom of the d@- passage of the bolt, :i holt the head of which is seate'd in said depression, 1nd u screw Cup closing the opening in the housmg.

In testimony whereof, we have signed this specification in the preseneeof two subserihv1,' ing witnesses..

I BENJAMIN l1). D. *"lAFIKHlI).

FREDERICK K, LANDGRAF.

Witnesses: I

EDWIN'ZS-RYC12, F. H., ALLISON. 

